EP 4258215 A1 20231011 - DEVICE-LESS MOTION STATE ESTIMATION
Title (en)
DEVICE-LESS MOTION STATE ESTIMATION
Title (de)
VORRICHTUNGSFREIE BEWEGUNGSZUSTANDSSCHÄTZUNG
Title (fr)
ESTIMATION D'ÉTAT DU MOUVEMENT SANS DISPOSITIF
Publication
Application
Priority
US 202263327831 P 20220406
Abstract (en)
A method and a system for reconstructing a CT image of a subject are provided, as well as an imaging arrangement for acquiring a CT image, and a computer program for carrying out the method. The method for reconstructing the CT image comprises receiving projection image data, selecting consecutive portions of data, and reconstructing each of the portions into a volumetric slab image to form a sequence of images. The method also comprises extracting a motion function from the sequence by registering each slab image to another slab image separated in the sequence by a separation parameter to obtain a difference metric, selecting a sequence of difference metrics, and forming a motion function using the selected sequence. The method further comprises identifying trigger points in the motion function to define motion states, grouping the projection image data into these motion states, and reconstructing a volumetric image for each motion state.
IPC 8 full level
G06T 11/00 (2006.01)
CPC (source: EP)
G06T 11/005 (2013.01); G06T 2211/412 (2013.01)
Citation (search report)
- [A] US 2021295574 A1 20210923 - GRASS MICHAEL [DE], et al
- [Y] MCCLELLAND JAMIE ET AL: "A continuous 4D motion model from multiple respiratory cycles for use in lung radiotherapy", MEDICAL PHYSICS, AIP, MELVILLE, NY, US, vol. 33, no. 9, 29 August 2006 (2006-08-29), pages 3348 - 3358, XP012092272, ISSN: 0094-2405, DOI: 10.1118/1.2222079
- [Y] CHAVARRIAS C ET AL: "Extraction of the respiratory signal from small-animal CT projections for a retrospective gating method", PHYSICS IN MEDICINE AND BIOLOGY, INSTITUTE OF PHYSICS PUBLISHING, BRISTOL GB, vol. 53, no. 17, 7 September 2008 (2008-09-07), pages 4683 - 4695, XP020141390, ISSN: 0031-9155
- [A] GRASS M ET AL: "Motion compensation for non-gated helical CT: application to lung imaging", PROGRESS IN BIOMEDICAL OPTICS AND IMAGING, SPIE - INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING, BELLINGHAM, WA, US, vol. 10573, 9 March 2018 (2018-03-09), pages 105733H - 105733H, XP060104969, ISSN: 1605-7422, ISBN: 978-1-5106-0027-0, DOI: 10.1117/12.2292879
- [A] ZHANG YONGBIN ET AL: "Modeling respiratory motion for reducing motion artifacts in 4D CT images", MEDICAL PHYSICS, AIP, MELVILLE, NY, US, vol. 40, no. 4, April 2013 (2013-04-01), pages 41716 - 41716, XP012171095, ISSN: 0094-2405, [retrieved on 20130320], DOI: 10.1118/1.4795133
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DOCDB simple family (application)
EP 22181761 A 20220629